I have a 86 F-150 4x4 with a 300 straight six.

The bottom end is getting noisy so I am looking around for an engine.

I have found one (out of an 85) for $200 but was told the piston pins are noisy in it. He went on to say it has been like this since new and is in great shape ..... hmmmmm.

I called a few wreckers ..... most had none.

One that did have one said it was a 90's motor with an automatic ( I have a manual transmission) and would not be compatible.

Are not all 300's compatible????

Can I not just take the flywheel off mine?

Thanks .... Mike

 

90's would most likely be fuel injected. It would need the correct ECU and all sensors and such at the very least. I'm no expert however.

You could use the EFI motor and convert it to use your intake and carburetor but would have to de-shroud the valves I think.

As far as the transmission, I'm not sure about flywheel but I would think you could take your transmission and bellhousing and make it would work.

Again; no expert but that's my 2 cents

Not much help now that I think about it..

 

What is "de-shroud" the valves?

I would definitely put my intake on it.

My engine has been stripped of it's original closed loop carburetor, computer and air pump.

I could also put in my distributor.

I just want to make sure all 300's will bolt up the same.

Also with my carb and distributor will they all run ( no difference in cam and such).


Thanks ..... Mike

 

If I recall correctly, the EFI head shrouds the valves, reducing the airflow a bit. De-shrouding increases the airflow.

Since your issue seems to be in the bottom end, I suppose you could just consider this a short block and use your existing heads.

I bought a 4.9 from a 85 E250 and am planning to rebuild it to replace my engine. Mine is running fine, but I wanted to rebuild one..
The one I bought had a carburetor but I'm not sure what transmission. I guess I'll find out how well it will work for me when it gets here.

Need to build a test stand...

 

engine mounts and bellhousing patterns are all the same, if that is what you're asking.

 

That's what I figured; as long as you have the bell housing from your transmission, it shouldn't be an issue..

 

So just to make sure I understand ....

The bolt pattern is the same on all 300's so I can bolt on my belhousing.

I can take take off the flex plate and bolt on my flywheel.

I can pull off the intake (if it is fuel injected) and bolt on my intake.

I can use my distributor.

They should have a place for a mechanical pump but if they don't I can use an electric fuel pump.

Have I got it right?

Thanks .... Mike

 

Yes to all of the above.
But, be aware that carbureted & EFI engines have different A.I.R injection.

Air in head and air in manifold.
If you have to deal with emissions this might be a factor.
There are a bunch of threads on this if you search.

 

I assume ( but have not checked) that on my 86 I had injection into the manifold.

The air pump has been removed.

We have yearly inspections but three local mechanics said ( and one did ) pass my truck without the air pump.

They all said I just needed to make sure I still had the converter on it.

All the ports ( including oxygen sensors) have just been plugged.

I assume I can just do the same thing.

It would be easier if it is manifold injected as that is what I have now but i assume ( and I will check the threads) that I can just plug off a head injected the same way ???????

Thanks again so much !!!!!!!!!

Mike

 

Yes you can plug any holes.
The manifolds readily swap over either way.

 

One thing to note. The EFI block does not have a hole for the fuel pump.
Also, the later engines used a serpentine belt. The balancer is different, and the water pump may be too, I cannot recall if the 300 EFI used a reverse rotation water pump.

EFI head has extra bolt holes, for the later twin exhaust manifolds, however, the carb intake/exhaust logs will bolt up fine as the rest of the holes are all in the same locations.

The long and short of it is, yes you can use a later 300, but there's a lot of stuff that has to be swapped over. And you have to deal with the fuel pump, most add an inline electric pump.